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Instruction Manual
IM-105-4000, Original Issue
August 2005
OPM 4000
5-2
NOTE
All adjustments are on the signal processor PC Board (Figure 5-2).
5. Adjust the 20 turn zero potentiometer marked "PT -1", clockwise for an
up-scale reading >15%, then slowly
counterclockwise for 0-1% opacity.
Figure 5-2. Zero Calibration
6. Install the Micro-turn 200 on-line test reflector on the transceiver and
screw the device to the transceiver with the mounting screw. With the
thumbwheel, adjust the on-line reflector for the same opacity as in
previous step and lock it in place.
7. Place the highest value filter (for best results at least an 0.8 OD) in the
slot provided. Adjust the span potentiometer marked "PT-3" for the
filters correlated value
on the service module opacity display until it is
equal to the correlated value. See Section 6 for filter correlation
formulas.
8. Remove the filter and adjust the zero potentiometer PT-1 for 0-1%.
9. Insert the high filter and adjust PT-3 for its value; repeat steps until the
values come within 0.5% opacity.
10. Remove the on-line test reflector and replace the transceiver cover and
secure the transceiver in place. You must complete Zero Reflector
Adjustment procedure next.
ZERO REFLECTOR
ADJUSTMENT
1. After clear, or off stack zero, has been performed the zero reflector
needs to be adjusted.
2. Find and record the zero offset value found in the QUICK MENU under
Zero Cal Value, see Zero/Span Calibration Checks in Section 3 for
procedure to access the quick menu.
3. Place the Opacity/T
2
switch on the service module in the opacity
position to observe the correlated opacity on the digital display.
4. Swing open the transceiver and initiate a zero with the zero switch on
the service module to raise the zero reflector into place. Observe and
record the zero value after 30 seconds. Return the mirror to normal
resting position by returning the zero switch to operate position.
PT-1 Zero